CODEWITHSUNDEEP
linuxbashif-statementkeyboard-input
SSF
SSF

Reputation: 983

Give Error and Exit when no Keyboard Input is Provided

A rookie here! This is a very simple one. I am trying to write a script that asks for user inputs. Then read the inputs and do some stuff with it. But I first want to make sure inputs are provided.

Example:

echo "Please provide input1:"
read Input1
echo "Please provide input2:"
read Input2

if [ -z "$Input1" ]
echo "You did not provide input1"
exit
else if [ -z "$Input2" ]
echo "You did not provide input2"
exit 
fi

However the above doesn't work. Is there a way to make it work while making it look more readable? Is there a better simpler way?

Upvotes: 0

Views: 35

Answers (1)

glenn jackman
glenn jackman

Reputation: 246837

You want elif not else if, and you are missing the mandatory then keywords: https://www.gnu.org/software/bash/manual/bashref.html#Conditional-Constructs

read -p "Please provide input1: " Input1
read -p "Please provide input2: " Input2

if [ -z "$Input1" ]; then
    echo "You did not provide input1"
    exit
elif [ -z "$Input2" ]; then
    echo "You did not provide input2"
    exit 
fi

If, instead of exiting, you want to provide a default value, you can do:

read -p "Please provide input1: " Input1
read -p "Please provide input2: " Input2
: ${Input1:=first default value}
: ${Input2:=second default value}
echo "Input1: $Input1"
echo "Input2: $Input2"

Upvotes: 1

Related Questions